I have now implemented this and it is working great. So much data is available that I always thought could be available from the EcoNet interface.
Don’t want to drag another power supply into the picture? I have an add on version of the EcoNet Rheem electric hot water heater, so I do not know if this applies to others that have the EcoNet interface inbuilt. There is on pin 6 of the RJ-11/12 connector a +5V power supply. By using a short USB-C charging cable with the USB-A end removed, I soldered the positive (red) wire to the RJ-11/12 cable pin 6 with the negative (black) cable attached to the RS-485 terminal block GND terminal. The connection of the negative to the RS-485 terminal block is not actually necessary as the RJ-11/12 pin 5 GND connection is common.
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